Tight holding nut



TIGHT HOLDING NUT Filed April 18, 1928 indrawing, in whichy l Y front and sidevelevation Referring to; the drawing, 1d screw and 2 my Patented June 6, 1933 A1.1181111111) STATES PAUL coun'rngctrn, or VINCENNES, FRANCE f TIGHT HOLDING 'NUT i Application-med April 18, 1928, Serial No. 270,940,11nd in France Aprilv 19, 1927.

My invention relates to an improvement in tight 'holding nuts for. screws and 'bolts of the type in which the nut may be securely locked to the thread upon which it is placed.

The object of the invention is to provide a nut of the character indicated with a bifur-A cated projection over which a counter,` nut is adapted to be fitted and clamp the nut tightly to the bolt or screw upon which it is placed. h

Another object of the .invention is topro vide thevscrew with which the nut is used with a plurality of longitudinal grooves into which ilexibleteeth provided on the biurcated projection of the nut are adapted to penetrate when pressed inwardly by the counter-nut.

A more specific object of the invention is to provide `a nut with a bifurcated conical male member and a counter nut with' a correspondin female member, the said female member being` adapted to tightly clamp the male member to the threads upon which the nut is mounted..

Other objects of the invention will ob- -vious to those skilled in the art to which the invention relates in the following descrip 'tion taken in connection with the accompany ig. lis a view of my improved nut and counter nut in section 'applied to a screw Fig'. 2 is a side elevational viewof the nut; Fig. B'shows a modified form'of nut`in Fig. 4 shows a form of screw for'use with the nut of Fig. 3 in partial side and end ele-- v-ation; and Fig. 5 is afront elevational view of a modified'form oi'nut similar toFi'g. 3. A ignates a improved' nut. vThe said nut is provided with a conical extension 3, in which'is cut a notch 4 for im arting flexibility thereto and allcwin sai sion .to be clamped on t e screw 1 by means of a counter-nut -5, which, as shown in Fig. 1 is provided with a conical recess corre spon ing to the projection 3.

Once the nut is in place upon its screw, the

counter-nut` 5 is screwed home, which causes therein, -I may provide conical extenthe conical recesses thereof to tightly engage the conical extension?, of screw 1 and cause rendered perfectly tight holdin In the embodiment shown in lgs. 3 and 4, y l t 4the nut is providedl with four'tongues Z1, l2, la

and Z., formed by cutting notchesln the comcal extension similar to notches 4 of Fig. 2

but which are diametrically disposed in pairs 13.0

on said extension. The screw V for use with this nut (Fig. 4) is of the ordinary type in which are provided four slots r1, r2, 1', and r4.

The operation of this embodiment is analogous to' that previously described. The 55 nuL is tightened against the vmember to be secured and the counter-nut. turned .which causes the conical female member thereof to exert a pressure on the tongues which fall in line with one of the longitudinal ,notches of 5.70

screw V and forces said tongues to enter their 'corresponding notch, thereby preventing unscrewing ofthe nut.

For Idismounting, it is merely necessary, after loosening the counter-nut to slide a,y 'sharp to'ol under the tngueswhich are easily their'flexibility. Once the,

displaced due to tonguesare released from the notch the main nut ymay -be easily loosened. .This embodiment has -the ladvantage of 4being easily dis-I s? mounted.

.1 In the 'case of a screw having a very small cross-section, instead-.of providing four slots only two or even a single one, in which case 'the number of tongues providedv correspond to the number of slots.

V11i-Figa isilmamtedmt similari 8o that .shown in Fig..'3 but wherein the 'nut 2 9o -hasjtliin-metallic strips secured to the fiat 'sides cof the nut at' opposite points'by means of solder or preferably by 'means' of small l screws r rivets 7 v Each str ip'has an inward.-v

'3, the only ldifference being that the tongues :ly projecting tongue 7 similarto the tongues 95 lrrileoper tionof are ma ,in Figs is ideati. 'i cal to that described inconnection with Fig.

Likewise the counter-nut may in certain cases be substituted by a mechanical snap.

While I have shown what I deem to be the preferable form of my device I do not wish -to be limited thereto as there might be vari- `longitudinal slots in said male element and means on said counter-nut for causing a tongue to enter one of said slots when said counter-nut is tightened on said nut whereby loosening of said nut on said male element is prevented.

2. A tight holding bolt, comprising in combination, a threaded male element, a nut for said male element, a counter-nut for said nut, a .flexible conically dis osed tongue carried by said nut, a longitudlnal slot in said male element and a conical liange on said counter- -nut for causing said tongue to enter said slot when said counter-nut 1s tightened on said nut whereby loosening of said nut on said male element is prevented.

3. A tight holding bolt, comprising in combination, a threaded male element,y a nut' signature.

to enter one of said slots whensaid counternut is tightened on said main nut whereby loosening of said nut on said male element is prevented.

6. A tight holding bolt, comprising in combination', a threaded male element, a nut for said male element, a counter-nut for vsaid nut, a plurality of thin metallic strips secured to said nut, longitudinal slots in said male element and a conical flange on said counter-nut for causing one of said strips to enter one of said slots when said counter-nut is tightened on said nut whereby loosening of said nut on saidmale element is prevented.

In testimony whereof I hereunto aix my PAUL COURTEILLE.

BIJv

for said male element, a counter-nut for said nut, a pair of diametrically disposed flexible conically extending tongues carried by said nut, four longitudinally extending symmetrically disposed slots in said male element and a conical flange on said counter-nut for causing one of said tongues to enter one of said slots when said counter-nut is tightened on said nut whereby loosening of said nut on said male element is prevented.

4. A tight holding bolt, comprising in comblnation, a threaded male element, a nut for said male element, a counter-nut for said nut, a pair of diametiically disposed flexible conically extending tongues carried by said nut, four longitudinally extending symmetrically disposed slots in said male element and means on said counter-nut for causing one of said tongues to enter one of said slots when said counter-nut is tightened on said nut whereby loosening of saidnut on said male element is prevented.

5. tight holding bolt, comprising in comb1nat1ona threaded male element, a main nut for said male element, a counter-nut for said nut, a plurality of thin metallic strips secured to said main nut, a plurality of longitudinal slots in said male element and means on said counter nut for causing a strip 

